Riddle ME this

[Gwaihir the Windlord]

Gurthang, or Anglachel. It seems to fit pretty well.

SHarp as a Tack,
Put in a stack, Thingol's armouries
Conquers friend and foe alike, slays anything it pricks
a type of sword,
for a fell race, the Elves of Beleriand, or the Haladin
used in place
of a spear or mace, Turin chose it above other weapons in the end (though not these ones specifically. Oh well, I thought I might have had it perfectly there.)
weapon of the mighty, Turin's sword, the Mormakil, a famed warrior
and of the weak...; described, 'a stabber of foes unseen.'

Hmmm.... not perfect!